Make dla and drunken map builders implement MetaMapBuilder trait

src/map_builders/dla.rs

@@ -2,7 +2,7 @@ use rltk::RandomNumberGenerator;
 
 use super::common::{paint, Symmetry};
 use crate::components::Position;
-use crate::map_builders::{BuilderMap, InitialMapBuilder};
+use crate::map_builders::{BuilderMap, InitialMapBuilder, MetaMapBuilder};
 use crate::TileType;
 
 #[derive(PartialEq, Copy, Clone)]
@@ -25,6 +25,12 @@ impl InitialMapBuilder for DLABuilder {
     }
 }
 
+impl MetaMapBuilder for DLABuilder {
+    fn build_map(&mut self, rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap) {
+        self.build(rng, build_data);
+    }
+}
+
 impl DLABuilder {
     pub fn new() -> DLABuilder {
         DLABuilder {
@@ -66,6 +72,15 @@ impl DLABuilder {
         })
     }
 
+    pub fn heavy_erosion() -> Box<DLABuilder> {
+        Box::new(DLABuilder {
+            algorithm: DLAAlgorithm::WalkInwards,
+            brush_size: 2,
+            floor_percent: 0.25,
+            ..DLABuilder::new()
+        })
+    }
+
     #[allow(clippy::map_entry)]
     fn build(&mut self, rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap) {
         let starting_position = Position {

src/map_builders/drunkard.rs

@@ -2,7 +2,7 @@ use rltk::RandomNumberGenerator;
 
 use super::common::{paint, Symmetry};
 use crate::components::Position;
-use crate::map_builders::{BuilderMap, InitialMapBuilder};
+use crate::map_builders::{BuilderMap, InitialMapBuilder, MetaMapBuilder};
 use crate::TileType;
 
 #[derive(PartialEq, Copy, Clone)]
@@ -29,6 +29,13 @@ impl InitialMapBuilder for DrunkardsWalkBuilder {
     }
 }
 
+impl MetaMapBuilder for DrunkardsWalkBuilder {
+    #[allow(dead_code)]
+    fn build_map(&mut self, rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap) {
+        self.build(rng, build_data);
+    }
+}
+
 impl DrunkardsWalkBuilder {
     pub fn new(settings: DrunkardSettings) -> DrunkardsWalkBuilder {
         DrunkardsWalkBuilder { settings }